MB90F654A FUJITSU [Fujitsu Component Limited.], MB90F654A Datasheet - Page 34

• Manufacturer Part Number: MB90F654A
• Description: 16-bit Proprietary Microcontroller
• Manufacturer: FUJITSU [Fujitsu Component Limited.]

34
MB90650A Series
(Continued)
* : The operation of reading or writing to I/O ports is slightly different from reading or writing to memory, as follows.
When pins are used as ports, the register bits control the corresponding pins as follows.
• Input mode
• Output mode
• P47, P70 to P72
Read: Reads the corresponding pin level.
Write: Writes to the output latch.
Read: Reads the value of the data register latch.
Write: The value is output from the corresponding pin.
No DDR for this port. Data is always available in this port, so when using P70 and P71 as I
value to “1”. (Otherwise when using P70 and P71 by themselves, turn off the I
As this port is open-drain output style, so when using this port as an input port, in order to turn off the output
transister, set the output data resister value to “1” and add the pull up resister to the external pin.
0: Input mode
1: Output mode
Bits are set to “0” by a reset.
2
C.)
2
C pin, set PDR